99978250 has 16 divisors (see below), whose sum is σ = 187159752. Its totient is φ = 39991200.

The previous prime is 99978227. The next prime is 99978251. The reversal of 99978250 is 5287999.

It can be written as a sum of positive squares in 4 ways, for example, as 22344529 + 77633721 = 4727^2 + 8811^2 .

It is a junction number, because it is equal to n+sod(n) for n = 99978194 and 99978203.

It is not an unprimeable number, because it can be changed into a prime (99978251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199707 + ... + 200206.

Almost surely, 2^99978250 is an apocalyptic number.

99978250 is a deficient number, since it is larger than the sum of its proper divisors (87181502).

99978250 is a wasteful number, since it uses less digits than its factorization.

99978250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399930 (or 399920 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 99978250 is about 9998.9124408608. The cubic root of 99978250 is about 464.1252294022.

The spelling of 99978250 in words is "ninety-nine million, nine hundred seventy-eight thousand, two hundred fifty".